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- Foxboro
- RH928AX
- Termination Cable Assembly
- USA
- 2 meters
- 3 kg
- Xiamen, China
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Product Overview
The Foxboro RH928AX is an I/A Series termination cable assembly used to connect compatible fieldbus module baseplates to termination assemblies in industrial process-control systems. It forms part of the signal-wiring path between the field module subsystem and the termination hardware, allowing field I/O connections to be routed through a removable cable rather than permanently wiring the module baseplate directly to the termination assembly.
The RH928AX is a 2-meter Type 5 low-smoke zero-halogen (LSZH) termination cable. Its length allows the termination assembly to be positioned away from the module baseplate within the limits of the installation layout. The LSZH jacket material is relevant to installations where reduced smoke generation and the absence of halogens in the cable-jacket material are required.
When selecting this cable for maintenance or system expansion, confirm the termination cable type, the associated fieldbus module, and the termination assembly part number. Similar-looking Foxboro termination cables can use different cable types or serve different module configurations, so cable length alone is not sufficient to establish compatibility.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Foxboro |
| Model | RH928AX |
| Product Series | I/A Series |
| Product Type | Termination Cable Assembly |
| Cable Length | 2 meters |
| Cable Type | Type 5 |
| Cable Jacket Material | Low Smoke Zero Halogen (LSZH) |
| Baseplate-End Connector | 37-pin D-subminiature |
| Termination-Assembly-End Connector | 25-pin D-subminiature |
| Operating Temperature Range | -40 to +105°C |
| Application | Fieldbus module baseplate-to-termination assembly connection |
| Shipping Weight | 3 kg |
Product Features
- 2-meter cable length: Provides a defined connection length for compatible baseplate and termination-assembly layouts.
- Type 5 configuration: Identifies the cable variant for the corresponding Foxboro termination system.
- LSZH jacket: Uses low-smoke zero-halogen cable-jacket material.
- D-subminiature connectors: Uses the documented 37-pin baseplate-end and 25-pin termination-assembly-end connector arrangement.
- Removable cable assembly: Supports separation of the fieldbus module baseplate from the termination assembly during appropriate maintenance work.
- Industrial control-system integration: Connects compatible I/A Series fieldbus hardware within a configured process-control installation.
- Defined temperature range: The cable material specification covers operation from -40 to +105°C.
- Variant-specific identification: The RH928AX part number helps distinguish the 2-meter Type 5 LSZH cable from other termination cable lengths and types.
Working Principle
The RH928AX carries the electrical connections between a compatible fieldbus module baseplate and its associated termination assembly. The fieldbus module interfaces with the control system, while the termination assembly provides the connection point for the corresponding field wiring. The cable links these two parts of the I/O architecture.
During normal operation, electrical signals pass through the cable’s internal conductors and connector contacts according to the assigned pinout. Correct connector engagement and the proper cable variant are necessary to maintain the intended signal paths. The RH928AX should therefore be selected by its complete part number and the hardware configuration it serves, rather than by cable length alone.
The LSZH jacket is a material feature of the cable assembly. It is intended to limit smoke generation and avoid halogen-containing emissions from the jacket under the relevant fire conditions. This characteristic does not replace the need to follow the installation’s electrical, environmental and fire-safety requirements.
Role in a Foxboro I/A Series Control Architecture
The RH928AX serves as an interconnection component between compatible fieldbus module hardware and termination assemblies. It does not perform signal processing itself; instead, it maintains the electrical path needed for the associated field I/O configuration.
| System Component | Function | Relationship to the RH928AX |
|---|---|---|
| Foxboro Fieldbus Module | Interfaces field I/O with the control system | Connects through the module baseplate and associated termination wiring |
| Fieldbus Module Baseplate | Provides the module mounting and electrical interface | Connects to the termination assembly through the cable |
| RH928AX Termination Cable Assembly | Carries electrical connections between compatible hardware | Links the baseplate and termination assembly |
| Termination Assembly | Provides field wiring termination points | Connects field wiring to the module subsystem through the configured cable path |
| Field Instrumentation | Measures or controls process variables | Connects through the field wiring and applicable termination assembly |
| Foxboro I/A Series Control System | Processes field data and executes control strategies | Receives or sends signals through the configured I/O subsystem |
| Cabinet Wiring Infrastructure | Organizes and supports control-system wiring | Accommodates cable routing and connection access |
| Maintenance and Test Equipment | Supports inspection and fault isolation | Helps verify continuity and connection condition during authorized maintenance |
Industrial Applications
| Application | Connection Requirement | Role of the RH928AX |
|---|---|---|
| Process Automation Cabinets | Connection between module baseplates and termination assemblies | Provides the cable path for compatible I/O hardware |
| Chemical Processing Plants | Organized field I/O connections within process-control cabinets | Supports the wiring arrangement of compatible Foxboro systems |
| Oil and Gas Control Systems | Maintainable connections between fieldbus hardware and termination equipment | Connects the relevant module baseplate and termination assembly |
| Power Generation Control | Field signal integration into process-control equipment | Supports compatible termination-cable connections |
| Water and Wastewater Facilities | Field instrumentation connections to control-system I/O | Carries signals through the configured termination hardware |
| Industrial System Expansion | Addition or rearrangement of compatible I/O hardware | Provides a defined cable length for the associated installation |
| Control-System Maintenance | Replacement of a damaged or unsuitable termination cable | Restores the connection when the RH928AX is the correct specified variant |
| Process-Control Cabinet Refurbishment | Reorganization of module and termination hardware | Supports the planned wiring layout where the cable type is compatible |
Installation and Maintenance
- Verify the cable part number: Confirm that RH928AX is the specified cable variant for the intended fieldbus module and termination assembly.
- Check both connector interfaces: Verify that the 37-pin baseplate-end and 25-pin termination-assembly-end connectors match the equipment interfaces.
- Isolate the relevant equipment: Follow the site’s procedures for electrical isolation and process-control maintenance before disconnecting the cable.
- Inspect connector contacts: Look for bent pins, corrosion, contamination or damaged connector shells before installation.
- Check the connector keying: Align the connectors correctly and avoid forcing a connection that does not seat naturally.
- Secure the connectors: Fasten the connector hardware as specified for the installed equipment to prevent accidental loosening.
- Route the cable carefully: Avoid sharp bends, crushing, excessive tension and contact with moving machinery or hot surfaces.
- Maintain cabinet organization: Route the cable so it does not obstruct access to modules, termination assemblies or other serviceable components.
- Verify cable identification: Keep the RH928AX part number visible in maintenance records and cable documentation to reduce the risk of incorrect replacement.
- Check the intended cable type: Do not substitute another Foxboro cable solely because it has the same length or similar connectors.
- Inspect after maintenance: Confirm that both connectors are fully seated and that the cable jacket has not been damaged during cabinet work.
- Record replacement details: Document the installed cable model, associated hardware and any observed connector or wiring issues for future troubleshooting.
Related Components
| Component | Function | Relationship to the RH928AX |
|---|---|---|
| Foxboro Fieldbus Module Baseplate | Provides the module’s electrical interface | One end of the termination cable connection |
| Compatible Type 5 Termination Assembly | Provides field wiring termination points | Connects to the termination-assembly end of the cable |
| Foxboro FBM230 | Fieldbus module with serial-port functions | Associated with Type 5 termination cable configurations where specified |
| RH928AW | Type 5 LSZH termination cable, 1-meter variant | Related cable-length option |
| RH928AY | Type 5 LSZH termination cable, 3-meter variant | Related cable-length option |
| RH928AZ | Type 5 LSZH termination cable, 5-meter variant | Related cable-length option |
| Foxboro I/A Series I/O Subsystem | Interfaces field signals with the control system | Uses compatible fieldbus modules, baseplates and termination hardware |
| Field Instrument Wiring | Carries signals to and from field devices | Connects through the appropriate termination assembly |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Foxboro RH928AX | I/A Series Termination Cable Assembly | Main product | 2-meter Type 5 LSZH cable |
| Foxboro RH928AW | I/A Series Termination Cable Assembly | Shorter cable variant | 1-meter Type 5 LSZH cable |
| Foxboro RH928AY | I/A Series Termination Cable Assembly | Longer cable variant | 3-meter Type 5 LSZH cable |
| Foxboro RH928AZ | I/A Series Termination Cable Assembly | Longer cable variant | 5-meter Type 5 LSZH cable |
| Foxboro RH928AA | I/A Series Termination Cable Assembly | Different cable type | Type 1 LSZH cable; not a direct substitute based on length or jacket material alone |
| Foxboro RH916DB | I/A Series Termination Cable Assembly | Different material variant | 1-meter Type 1 P/PVC cable; verify system and cable-type requirements before selection |
Key Advantages
- Provides a defined 2-meter connection between compatible I/A Series baseplate and termination hardware.
- Uses Type 5 LSZH cable construction.
- Supports a removable termination-cable arrangement for maintenance and cabinet organization.
- Uses specified D-subminiature connector interfaces for the intended hardware configuration.
- Helps distinguish the required cable variant through a unique part number.
Technical FAQs
Which hardware interfaces does the RH928AX connect?
The documented cable arrangement uses a 37-pin D-subminiature connector at the fieldbus module baseplate end and a 25-pin D-subminiature connector at the termination assembly end. The mating equipment must match these interfaces and the required cable type.
What does Type 5 mean for the RH928AX?
Type 5 identifies the termination cable configuration listed for compatible Foxboro hardware. It is a system-specific cable designation, so it should not be treated as interchangeable with Type 1 or Type 2 cables simply because connector styles or cable lengths appear similar.
Why choose the RH928AX instead of a 1-meter or 3-meter cable?
The RH928AX provides a 2-meter cable length. The appropriate length depends on the physical arrangement of the baseplate and termination assembly, the required routing path and the installation’s cable-management constraints. The cable type and connector compatibility must also match.
Can the RH928AX be replaced with an LSZH cable of the same length from another Foxboro series?
Not automatically. The replacement must match the required termination cable type, connector pinout and supported module/termination configuration. A matching length and LSZH jacket do not by themselves establish electrical or mechanical compatibility.